Document Type

Conference Paper

Publication Date




Publication Title

Proceedings of the 20th International Conference on RF Superconductivity



Conference Name

20th International Conference on RF Superconductivity, 27 June- 2 July, 2021, East Lansing, Michigan


One of the building blocks of modern particle accelerators is superconducting radiofrequency (SRF) cavities. Niobium is the material of choice to build such cavities, which operate at liquid helium temperature (2 - 4 K) and have some of the highest quality factors found in Nature. There are several sources of residual losses, one of them is trapped magnetic flux, which limits the quality factor in SRF cavities. The flux trapping mechanism depends on different niobium surface preparations and cool-down conditions. Suitable diagnostic tools are not yet available to study the effects of such conditions on magnetic flux trapping. A magnetic field scanning system (MFSS) for SRF cavities using Hall probes and Fluxgate magnetometer has been designed, built, and is commissioned to measure the local magnetic field trapped in 1.3 GHz single-cell SRF cavities at 4 K. In this contribution, we will present the preliminary results from MFSS for a single cell niobium cavity.


Published by JACoW Publishing under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) license. Any further distribution of this work must maintain attribution to the author(s), the published article's title, publisher, and DOI.

Original Publication Citation

Parajuli, I. P., Ciovati, G., Delayen, J. R., & Gurevich, A. V. (2022). Preliminary results from magnetic field scanning system for a single-cell niobium cavity. In K. Saito, T. Xu, N. Sakamoto, A. Lesage, & V.R.W. Schaa (Eds.), Proceedings of the 20th International Conference on RF Superconductivity (pp. 96-99). JACoW.


0000-0002-0873-2068 (Parajuli), 0000-0003-0759-8941 (Gurevich)